Magnetic resonance imaging local coil composed of separate parts

Abstract

A separated coil for a magnetic resonance imaging system has a first partial coil in a first partial casing and a second partial coil in a second partial casing, the first and second partial coils being connected to a connector for connection to the imaging system via a first cable and a second cable, respectively. The coil also has a coupler having a first part disposed in the first partial casing and connected to the first partial coil, and a second part, coupled to the first part, disposed in the second partial casing. The first cable is disposed in the second partial casing, and the second part of the coupler is connected to the connector for connection to the imaging system via the first cable. The signals in the first partial coil are coupled and connected to the cable and the connector via the coupler.

1. A separate type coil for a magnetic resonance imaging system, comprising:
 a first partial coil in a first partial casing and a second partial coil in a second partial casing, said first partial coil and said second partial coil being connected to a connector for connection to the imaging system via a first cable and a second cable, respectively; 
 An inductive coupler comprising a first part and a second part that are coupled to each other, the first part of the coupler being disposed in the first partial casing and being connected to said first partial coil, the second part of said coupler being disposed in the second partial casing, said first cable being disposed in the second partial casing, and the second part of said coupler being connected to the connector for connection to the imaging system via said first cable; and 
 an equivalent circuit of each coil unit in said first partial coil and the coupler comprising: a coil unit inductance, a capacitance assembly for adjusting the performance criteria of the coil unit, two parts of mutually coupled inductance of the coupler, a detuning loop for the coil unit and an amplifier with one side of said capacitance assembly being connected to said coil unit inductance, the other side of said capacitance assembly being connected to the first part of the mutually coupled inductance of the coupler, one side of said detuning loop being connected to the second part of the mutually coupled inductance of the coupler, the other side of said detuning loop being connected to said amplifier, and the other side of the amplifier being used for connection with the first cable. 
 
     
     
       2. The separate type coil as claimed in  claim 1 , wherein said first partial coil comprises at least one coil unit, and each coil unit corresponds to a coupler. 
     
     
       3. The separate type coil as claimed in  claim 1 , wherein said coil unit inductance, the capacitance assembly for adjusting the performance criteria of the coil unit, and the first part of the mutually coupled inductance of the coupler are disposed in the first partial casing, and the second part of the mutually coupled inductance of the coupler, the detuning loop and the amplifier are disposed in the second partial casing. 
     
     
       4. The separate type coil as claimed in  claim 1 , wherein the first part and the second part of the mutually coupled inductance of the coupler in combination, are butterfly-shaped. 
     
     
       5. The separate type coil as claimed in  claim 1  wherein said first partial coil in said first partial casing and said second partial coil in said second partial casing, and said coupler, are configured to form a head coil. 
     
     
       6. The separate type coil as claimed in  claim 1  wherein said first partial coil in said first partial casing and said second partial coil in said second partial casing, and said coupler, are configured to form a knee coil.